一种不增加孔隙溶液pH值的用于ASR控制的锂基添加剂

D. Stokes, H. H. Wang, S. Diamond
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引用次数: 17

摘要

研究了硝酸锂基外加剂对硅酸盐水泥水化膏孔隙溶液氢氧离子浓度的影响。在混合物中使用这种添加剂不会导致氢氧化物离子浓度的显著增加,因此这与任何其他锂化合物发表的研究都不同。据报道,锂盐的剂量不足会增加ASR引起的膨胀。作者提出,这主要是由于观察到其他锂盐的氢氧化物浓度增加,因此这种混合物不会显示出效果。砂浆棒试验验证了硝酸锂基掺合料在任何剂量下都不会增加膨胀的假设。这是一种更安全的外加剂,可以在现场使用,降低ASR膨胀的风险。由于硝酸锂溶液比氢氧化锂溶液更接近中性pH值,因此处理起来也比氢氧化锂基外加剂安全得多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Lithium-Based Admixture for ASR Control that Does Not Increase the Pore Solution pH
This paper describes the effect of a lithium nitrate-based admixture on the hydroxide ion concentration of the pore solution of hydrating pastes made from portland cement and water. No significant increase in the hydroxide ion concentration results from using this admixture in the mix, which is thus different than any published study with any other lithium compound. It has been reported that underdosing with lithium salts can increase the expansion due to ASR. The authors propose that this is mainly due to increases in hydroxide concentration observed with other lithium salts and therefore this admixture will not show an effect. Mortar bar tests with the new admixture verify the hypothesis that the lithium nitrate-based admixture does not increase expansion at any dose. This is then a much safer admixture to use in the field with respect to risk from damaging ASR expansions. It is also much safer to handle than lithium hydroxide-based admixtures since solutions of lithium nitrate are much closer to neutral pH than lithium hydroxide solutions.
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